Crystal Orientation Distribution of TC18 Titanium Fabricated by Electron Beam Wire Deposition

doi:10.11901/1005.3093.2016.422

Chinese Journal of Materials Research

2017, Vol. 31

Issue (3): 203-210 DOI: 10.11901/1005.3093.2016.422

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Crystal Orientation Distribution of TC18 Titanium Fabricated by Electron Beam Wire Deposition

Wei DONG¹(

),Zhitao HUANG¹,Hongmei LIU²,Guang YANG¹,Yang YANG¹,Fan YANG¹

1 Beijing Aeronatical Manufacturing Technology Research Institute, Science and Technology on Power Beam Processes Laboratory, Beijing 100024, China
2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100038, China

Cite this article:

Wei DONG,Zhitao HUANG,Hongmei LIU,Guang YANG,Yang YANG,Fan YANG. Crystal Orientation Distribution of TC18 Titanium Fabricated by Electron Beam Wire Deposition. Chinese Journal of Materials Research, 2017, 31(3): 203-210.

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Abstract

TC18 titanium was fabricated by Electron Beam Wire Deposition (EBWD). The distribution of crystal orientation and columnar structure of the alloy was investigated. The results show that the macrostructure of TC18 titanium consisted of large columnar grains orientated perpendicular to the workbench plane. The forming of columnar structure is a process of directly epitaxial growth of the β grains on the melt-pool bottom. Crystal orientation distribution has clear regularities, β-α phase structure transition has inherited characteristics. Most of the β grain with <001> direction present a strong fiber texture with orientation difference less than 10°. There are obvious characteristics among different columnar crystals and distribution direction for TD, LD and normal surface ND. Burgers orientation relation was strictly followed in the process of β→α. The lamella α phase precipitates within the same β grain satisfy the Burgers orientation relationship. There are 6 kinds of orientation for α phase in a columnar grain and there exists strong variant choice of orientations for β→α transformation process.

Key words: metallic materials TC18 titanium Electron Beam Wire Deposition column crystal epitaxial growth textur

Received: 21 July 2016

Fund: Supported by National Natural Science Foundation of China (No.51205178) and Natural Science Foundation of Gansu Province (No.1208RJZA189)

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	Wei DONG
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	Fan YANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.422 OR https://www.cjmr.org/EN/Y2017/V31/I3/203

Fig.1 Schematic of TC18 samples fabricated by EBWD

Fig.2 Macrostructure of TC18 titanium fabricated by EBWD

Fig.3 Microstructure of TC18 titanium fabricated by EBWD

Fig.4 Texture pole figure and ODF of α phase texted by XRD

(a) {0002} (b) ODF (c) {100-1} (d) {101-1}

Fig.5 Texture pole figure of β phase texted by XRD (a) {110} (b) {100}

Fig.6 EBSD orientation imaging figure of TC18 fabricated by EBWD

(a) SEM image, (b) orientation maps of α phase and β phase, (c) α phase, (d) β phase

Fig.7 EBSD pole figures of TC18 fabricated by EBWD

(a) β phase (b) α phase

Fig.8 ODF figure of TC18 α phase

Fig.9 Orientation distribution difference of α phase

Fig.10 Schematic illustration of β grain-coarsening in HAZ beneath the melt-pool

Fig.11 Relationship between crystal α lamellar and β matrix

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